* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #ec4899;
    --light-bg: #f8fafc;
    --dark-text: #1e293b;
    --gray-text: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: var(--dark-text);
    background-color: #ffffff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    background-color: #ffffff;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.navbar-brand {
    display: flex;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.logo {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.navbar-menu a {
    text-decoration: none;
    color: var(--dark-text);
    font-weight: 500;
    transition: color 0.3s ease;
}

.navbar-menu a:hover,
.navbar-menu a.active {
    color: var(--primary-color);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--dark-text);
}

/* Hero Section */
.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    min-height: 600px;
    display: flex;
    align-items: center;
}

.hero .container {
    width: 100%;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-text h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-image {
    text-align: center;
}

.hero-image img {
    width: 100%;
    max-width: 300px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #be185d;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background-color: white;
    color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Features Overview */
.features-overview {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.features-overview h2,
.benefits h2,
.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--dark-text);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--dark-text);
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--gray-text);
    font-size: 0.95rem;
}

/* Benefits */
.benefits {
    padding: 4rem 0;
    background-color: #ffffff;
}

.benefits-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.benefit-item {
    padding: 2rem;
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    border-left: 4px solid var(--primary-color);
    border-radius: 8px;
}

.benefit-item h3 {
    color: var(--dark-text);
    margin-bottom: 0.5rem;
}

.benefit-item p {
    color: var(--gray-text);
}

/* CTA Section */
.cta-section {
    padding: 4rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.cta-section h2 {
    color: white;
}

.cta-section p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

/* Footer */
footer {
    background-color: #1e293b;
    color: #cbd5e1;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: white;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #cbd5e1;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #334155;
    color: #94a3b8;
}

/* Documentation Styles */
.doc-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 0;
    text-align: center;
    margin-bottom: 3rem;
}

.doc-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.doc-header p {
    font-size: 1.1rem;
    opacity: 0.95;
}

.doc-grid {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.sidebar {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: 12px;
    height: fit-content;
    position: sticky;
    top: 100px;
}

.sidebar h3 {
    margin-bottom: 1rem;
    color: var(--dark-text);
}

.sidebar ul {
    list-style: none;
}

.sidebar ul li {
    margin-bottom: 0.5rem;
}

.sidebar a {
    color: var(--gray-text);
    text-decoration: none;
    display: block;
    padding: 0.5rem;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.sidebar a:hover,
.sidebar a.active {
    background-color: white;
    color: var(--primary-color);
    font-weight: 600;
}

.doc-content {
    background-color: white;
}

.doc-section {
    margin-bottom: 2rem;
    padding: 2rem;
    background-color: var(--light-bg);
    border-radius: 12px;
}

.doc-section h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.doc-section h3 {
    color: var(--dark-text);
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
}

.doc-section p {
    color: var(--gray-text);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.doc-section ul,
.doc-section ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.doc-section li {
    margin-bottom: 0.5rem;
    color: var(--gray-text);
}

.code-block {
    background-color: #1e293b;
    color: #e2e8f0;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1rem 0;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.note {
    background-color: #fef3c7;
    border-left: 4px solid #f59e0b;
    padding: 1rem;
    border-radius: 6px;
    margin: 1rem 0;
}

.note strong {
    color: #d97706;
}

.success {
    background-color: #d1fae5;
    border-left: 4px solid #10b981;
    padding: 1rem;
    border-radius: 6px;
    margin: 1rem 0;
}

.success strong {
    color: #059669;
}

.warning {
    background-color: #fee2e2;
    border-left: 4px solid #ef4444;
    padding: 1rem;
    border-radius: 6px;
    margin: 1rem 0;
}

.warning strong {
    color: #dc2626;
}

/* FAQ Styles */
.faq-item {
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-question {
    padding: 1.5rem;
    background-color: var(--light-bg);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    font-weight: 600;
    color: var(--dark-text);
}

.faq-question:hover {
    background-color: #f1f5f9;
}

.faq-toggle {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding: 0 1.5rem;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 1.5rem;
}

.faq-item.active .faq-toggle {
    transform: rotate(180deg);
}

.faq-answer p {
    color: var(--gray-text);
    line-height: 1.8;
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: 2rem auto;
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 12px;
}

/* Development Notice */
.development-notice {
    background: linear-gradient(135deg, #fef3c7 0%, #fcd34d 100%);
    border-left: 4px solid #f59e0b;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    margin: 2rem 0;
}

.development-notice h2 {
    color: #92400e;
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.development-notice p {
    color: #78350f;
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 0.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--dark-text);
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
    color: var(--dark-text);
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
    color: var(--dark-text);
    transition: border-color 0.3s ease;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.form-submit:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Responsive */
@media (max-width: 768px) {
    .navbar-menu {
        display: none;
    }

    .menu-toggle {
        display: block;
    }

    .navbar.mobile-menu-open .navbar-menu {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background-color: white;
        border-bottom: 1px solid var(--border-color);
        padding: 1rem;
        gap: 0;
    }

    .navbar.mobile-menu-open .navbar-menu li {
        border-bottom: 1px solid var(--border-color);
    }

    .navbar.mobile-menu-open .navbar-menu a {
        display: block;
        padding: 0.75rem 0;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hero-text h1 {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-image {
        order: -1;
    }

    .doc-grid {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
    }

    .features-overview h2,
    .benefits h2,
    .cta-section h2 {
        font-size: 2rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 1.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
}